Simple calculators. Clearer answers.

Everyday calculations in one place

Free, easy-to-use calculators for finance, math, health, dates, and conversions, with clear explanations and instant results.

Browse calculators

439Calculators

9Categories

4Languages

Choose the type of calculator you need

Mihsaba brings useful everyday calculators together in one clear, easy-to-use place. You can use every tool without creating an account, and each calculator includes a short explanation to help you understand the result.

Finance

Calculate loans, discounts, taxes, and interest with ease.

Math

Work out percentages, averages, and other everyday math.

Statistics & Probability

Analyze data, probability, distributions, and statistical tests.

⚛

Physics

Calculate motion, energy, waves, heat, fluids, and optics.

⚙

Engineering

Calculators for circuits, electricity, piping, pumps, and engineering applications.

⚗

Chemistry

Calculate concentration, pH, gas laws, yield, and osmotic properties.

♥

Health

Estimate general indicators such as BMI and daily energy needs.

◷

Date & Time

Calculate age, durations, and differences between dates.

⇄

Converters

Convert values between length, weight, temperature, and more.

Popular calculators

Percentage Calculator – 6 Free Calculation Modes

Find percent of a number, percentage changes, reverse percentages, increases and discounts with six free instant calculation modes.

x̄

Average Calculator – Mean, Median, Mode & Std Dev

Calculate mean, median, mode, population and sample standard deviation, sum and range instantly from your data.

□

Perimeter of a Square Calculator – P = 4 × Side

Calculate the perimeter of a square from its side, area or diagonal. Also find area, side length and both circle radii with step-by-step formulas.

⚡¤

kWh Price Calculator – Bill & Appliance Electricity Cost

Calculate cost directly from kWh used and electricity price, including optional charges and tax. Or estimate usage from appliance watts and hours.

⏱

Time Duration Calculator

Calculate elapsed time between a start and end time in hours, minutes and decimal hours, including overnight spans and an optional break.

⏢

Trapezoid Area Calculator – Perimeter, Bases & Height

Calculate trapezoid area from parallel bases and perpendicular height, solve for a missing height or base, and find perimeter when both legs are known.

p=mv

Momentum Calculator – p = mv, Mass & Velocity

Calculate linear momentum from mass and velocity, or solve for mass or velocity from p=mv, with common units and signed 1D direction.

bar↔psi

Pressure Converter – Torr, mmHg, PSI, Bar & atm

Convert pressure between Torr, mmHg, psi, bar, atm, Pa, kPa, MPa and other common units with explicit conversion definitions.

v=fλ

Wavelength to Frequency Calculator – λ, f & Wave Speed

Convert wavelength to frequency or frequency to wavelength, or solve wave speed from v=fλ, with multiple units and a vacuum-light-speed preset.

Hz↔RPM

RPM to RPS Converter – Frequency, Hz, Period & rad/s

Convert RPM to RPS and Hz, then find angular speed in rad/s or cycle period in seconds. Supports kHz, MHz, GHz, THz and BPM too.

Harmonic Mean Calculator

Calculate the harmonic mean for positive rates or values, with geometric and arithmetic means for comparison.

📅✓

Business Days Calculator – Count, Add & Subtract

Count business days between dates or add/subtract working days, with selectable weekend rules and optional custom holidays.

J↔kWh

Energy Converter: kWh, Joules & kW × Hours

Calculate kWh from kW and running hours, solve power or runtime, and convert energy between kWh, Wh, joules, kcal and BTU.

↔

Length Converter

Convert accurately among metres, kilometres, centimetres, feet and inches with explained factors.

m²

Area Converter – m², ft², Acres, Hectares & km²

Convert area online between m², km², hectares, acres, ft², yd² and cm² using precise factors, including square meters to square feet and hectares to acres.

Pois(λ)

Poisson Distribution Calculator

Calculate exact, at-most and at-least Poisson probabilities from mean rate λ and integer count k, plus mean, variance and standard deviation.

Standard Error Calculator – Mean & Proportion

Calculate the standard error of a mean or proportion from sample inputs, with a clearly labeled approximate 95% normal-theory margin.

log

Logarithm & Inverse Log Calculator – ln, log & Any Base

Calculate natural, common, binary or custom-base logarithms, plus the inverse exponent operation.

Weight & Mass Converter – kg, lb, g, oz & tonnes

Convert weight and mass online between kg, lb, g, oz, stones, metric tonnes and US short tons using precise factors, including kilograms to pounds and grams to kilograms.

R∥

Parallel & Series Resistor Calculator – Equivalent Resistance

Calculate equivalent resistance for parallel resistors or series resistors, with Ω, kΩ and MΩ inputs and the same resistor list compared both ways.

×10ⁿ

Scientific Notation Calculator – Standard, E & Engineering

Convert numbers to scientific notation, E notation and engineering notation, with powers of ten, worked examples and basic arithmetic.

πr²

Circle Calculator – Radius, Diameter, Circumference & Area

Enter radius, diameter, circumference or area to derive all four core circle measurements from one known value.

⌂

Mortgage Calculator – Monthly Payment and Interest

Estimate monthly mortgage payment, amount financed and total interest from property price, down payment, rate and term.

N↔lbf

Force Converter – N, kN, kgf & lbf

Convert newtons, kilonewtons, kilogram-force, pound-force, dynes and other force units while clearly separating force from mass.

Free printable math worksheets

Create free percentage and statistics practice sheets with worked answers and three levels.

Printable Percentage Worksheets With Answers – Free Generator

Generate 12 unique percentage practice problems at three difficulty levels. Print free percentage worksheets and optionally include step-by-step answer keys.

Mean, Median and Mode Worksheets With Answers

Generate printable mean, median, mode, range and standard deviation worksheets with 12 questions and step-by-step worked answers.

All printable worksheets

Worked calculation guides

Learn formulas, worked examples and common pitfalls before calculating.

How to Calculate Percentages: Formula & Worked Examples

Learn percent of a number, part-to-whole percent, increases and discounts with verified worked examples.

Mean vs Median: When to Use Each (With Examples)

Find the mean and median for even and odd datasets and see how outliers change the average.

kW vs kWh: Convert Power to Energy With Hours

Understand kW versus kWh: multiply power by hours, convert watts to kW and estimate usage and cost.

How to Find the Perimeter of a Square From Any Measurement

Find square perimeter from side length, area or diagonal using P = 4s and verified worked examples.

How to Calculate Hours Between Two Times (Including Overnight)

Calculate time between clock times, crossing midnight, unpaid breaks and decimal hours with examples.

Series vs Parallel Resistors: Formula and Worked Examples

Find equivalent resistance for series and parallel circuits with examples and the two-resistor shortcut.

All calculation guides

Why Mihsaba?

⚡

Instant results

Enter the required values and see your result right away without unnecessary steps.

ƒx

Understand the calculation

Clear formulas, examples, and practical notes show how the result is worked out.

文

Available in four languages

Use Mihsaba in Arabic, English, Spanish, or French and switch to the language that suits you.

Use results with care

Our calculators are designed to help with estimates and everyday understanding. Some finance and health results depend on the information you enter and general assumptions, so important decisions should be confirmed with the appropriate official source or qualified professional.